import wx

class wxclass(wx.Frame):
    def __init__(self,paranet,id):
        wx.Frame.__init__(self,paranet,id, 'First Window', size=(300,200))   
        panel=wx.Panel(self)

        lst = ['beef', 'tuna', 'oranges','eggs', 'peas']
        container = wx.ListBox(panel, -1, (20,20),(80,60), lst, wx.LB_SINGLE)
        container.SetSelection(3)
        
if __name__ == "__main__":
    app=wx.PySimpleApp()
    frame=wxclass(paranet=None, id=1)
    frame.Show()
    app.MainLoop()